CharacterStyle可以改变textview的一些属性，比如：背景色，前景色，下划线，点击事件等。效果如图：

点击button后，改变textview的一些属性的效果：

点击medium的时候弹出toast：

代码实例：

1 public class MainActivity extends Activity { 2  3     Button mbutton; 4     TextView mtextView; 5  6     @Override 7     protected void onCreate(Bundle savedInstanceState) { 8         super.onCreate(savedInstanceState); 9         setContentView(R.layout.activity_main);10 11         mtextView = (TextView) findViewById(R.id.mtextView);12         mbutton = (Button) findViewById(R.id.mbutton);13 14         mbutton.setOnClickListener(new OnClickListener() {15 16             @Override17             public void onClick(View v) {18 19                 SpannableStringBuilder ssBuilder = new SpannableStringBuilder(20                         mtextView.getText().toString());21                 CharacterStyle cStyle = new ForegroundColorSpan(Color.BLUE);22                 CharacterStyle cStyle1 = new BackgroundColorSpan(Color.GRAY);23                 CharacterStyle cStyle2 = new UnderlineSpan();24                 CharacterStyle cStyle3 = new ClickableSpan() {25 26                     @Override27                     public void onClick(View widget) {28                         Toast.makeText(getApplicationContext(), "hello",29                                 Toast.LENGTH_LONG).show();30 31                     }32                 };33 34                 ssBuilder.setSpan(cStyle, 0, mtextView.getText().length(),35                         Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);36                 ssBuilder.setSpan(cStyle1, 0, mtextView.getText().length(),37                         Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);38                 ssBuilder.setSpan(cStyle2, 0, mtextView.getText().length(),39                         Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);40                 ssBuilder.setSpan(cStyle3, 0, mtextView.getText().length() - 5,41                         Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);42 43                 mtextView.setText(ssBuilder);44                 mtextView.setMovementMethod(LinkMovementMethod.getInstance());45             }46         });47 48     }49 50 }